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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccc7ba7ffc1628dfe0800646b769e9f7f86cbeb31d4adb9e6cc37454f2a6c9b' 
  AND token = '42WiG+yWn58QypI0MO/m57L7tA9j6IAIwbJYafXDQfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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