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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7857f4deb4fc5f146b61e1f58773941253c72964c4b88421ad80cc8459bee5a4' 
  AND token = 'MJXrnggnHOcEHn9lE3TmwF/EpqA3QNm82vUqUTFYrdg=' 
  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"
    }
  }
}