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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb93958bde53bdef42745c256d5ec88b32e133b9d5992713933db8f55c6b0ac' 
  AND token = 'UIZRfwsP/Zd9CJtExtcm79i9B5I3DZq53TFktc0pRFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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