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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6003c1959912b0e4041d6b0ebe5b9e4d0f047a829de57462b7eb4f1447519264' 
  AND token = 'y1OHtQICc53LjAkY1CulnW+6VmqmCwlAZ5NAeQtx7ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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