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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd595d6c30705277760f735aa57c2c49cabc408a8e213c90eb17bfd091f96676' 
  AND token = 'QuTYM6dVW6Ozp+k6zXav7Rluv6SLnxPGO9RX3yobFKQ=' 
  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"
    }
  }
}