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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf62e7a83afef754246113adb99c14f1f391b223f247d4ff44f062948bdef15' 
  AND token = '0AHrVOUNB9ZB1786BBuPcSrqTZTO1Uo124yfU3Th7tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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