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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce55080dfab5084ac5a31ebfadbe06e1c7d0375df9ec93ab298b8364b028ecc' 
  AND token = 'hDRwBHwf4n6c9Rs6tn1an1oAhfDv+QUdXJ6SbpUwk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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