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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e75d27302add5d0ee1920b4a4bc6bc4f3dcb51f6037b6022e7ea3ed753f81a' 
  AND token = 'sYo+QonS1be/J/Xrsuzgg0mibCowBvuXGaAlDKx6QnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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