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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72fe2cd03bcd1a292379caaf884f1d0fa508fd152e7ff8c9df8c03ae60232d8' 
  AND token = 'TPub4NNYraIcT6h9ibGEJoC0tbe6YqKscxPF9o1QPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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