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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa902f85d460af4983462ee086e4792c2b58a5374e4864be10e53e635b45d30a' 
  AND token = 'yIffIQUwy1VaMKlBQH/ORupMeJ6sdc/+hN1+iIMeTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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