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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174f2c99d99c511b75bfbf3ba56f72edbcfd69bba941d40f91b7c233f03cd432' 
  AND token = 'J2X4qUYDLE1EFI6cNsjNz5Lr9/cwpYJe007Y4Zk+X/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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