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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b587632ca82a09c9d126e6395833d4c14b311347531f199153ff95d900423077' 
  AND token = 'bRMaXhd6xcA5p764dCmKOySqN9fFVWS5DJOMMHIKdW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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