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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f487abe8fdcdc2ef31b45d2b1fd7393df73e5eb4558119c0616e4812ddbb2a1c' 
  AND token = 'EQJ5C4u3FKo79eV60zqRfuOA2yJ5AlV4rtEkR/EU8D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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