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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dd0fb28172cb7340ff8d681a251a4117f0d8e7b806fcc7f00281a11b481feb' 
  AND token = 'h/W1QGsrpl9voLzVudaf9et70O51ytULYmzIWUQ7yeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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