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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d91c8a8c573c97acfc88c9bbac231a620e7f694553b05a63fb9584e9b82afed' 
  AND token = '/zCblROf3ZCTLHNGD7cOGREe7SxcklDmssuOWDphIG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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