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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0872c1f446c421a6977f07290cd917893ba5ee406d31e44acebf78665068be53' 
  AND token = 'vUDXvpnjwG3V3zP5c/wtroEWRu5eyELSjQVb5t1TMA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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