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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5362fc1919b1af52f5753f20a995f18fcecab103b03fee5b43f72549bdc5711' 
  AND token = 'SeqrNF4mqosLW/z5y6I5T2wqlF+B97/OBTcCfEMMEs8=' 
  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"
    }
  }
}