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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247ea9203f7a30524fc4cd9c040394d4e86718785e9b17851007f6e1a3ce6e4e' 
  AND token = 'eLK6lHG3cxuVj5rOgvZugYKZ71DD8ppAbXBpQBAp+60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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