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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36a9b8b0944039b245b93215ad13a12e34fb8d577a444f0a372bda1aa4b64ce' 
  AND token = 'yNZ4zcvfjfwEIyjpMK8252/8rq2t+Z3N0cEB4Yi+BPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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