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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b977ff14ed7d7b838e2c441f812d58a225628f8e898dc11547070d93bb09390' 
  AND token = 'mG6T8xOxoN6vwCoEoVQUiQrxsDHQeRQGqwe61+uTaA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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