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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d08da4f9fdf38d57c2d55fedf904b95a0bff4dc2d24a3db75e2072f53e27ab' 
  AND token = 'jKzHa3G1LzcQs7F8pRQhNPCZ/irgWkSChNUZ0Q7uRIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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