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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39463c1d33f5e28a1cf9956bedf3da3060323c63d17fa318064b38d23e0fcec9' 
  AND token = 'rBxxdNvcospMekPLkSak/qySOVEVBBwQAxWu6u7KmTQ=' 
  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"
    }
  }
}