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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd041eb2a0174df78889b6f6699e787cfd0f40fe9cb03d332d85279975c666c8' 
  AND token = 't8o/y55eJtKNnES0ojTFnroOh+lI02mvQEJc3X3fmp4=' 
  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"
    }
  }
}