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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99159edf6bf9f507739e53a47c24eb86d2d33f6ad726084ffc4663a6dedbe2fa' 
  AND token = 'ba/rB0M8eBQkGogyo31xPnO7xCBt1yUWKFMBZ/wzIZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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