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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917c96671297dbd96bd9f6d74260b3f19b7b5e97f84628965d0e13e5b5737699' 
  AND token = '6UI27oslOnCa9m/EZ41y3NKwLSbltBvsbhm1aoK0u6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}