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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a79f4fc3d883cfb17cef0c4368f2348c68d30d1c899d41838dc0459eaa29bd' 
  AND token = '6xu1cMIOL3I5nNA3pDM+hQLu7fa0XB0Magvz/cs8Xmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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