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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21c3501f070f8875dffeba360d86f46ebe6adb74b4f982cadd5e89db9b91b05' 
  AND token = 'eEcsMmuIhBnyB4n2r722qwcIzA8XSOWlC2yX+hpCtVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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