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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ba95b62a5c18bc3c9ddc93198baa8987ac050c51e940b65e3da878ed4974da' 
  AND token = 'JgjrvMYOJ6MpWDE3v8hHuYI7jEuerZFrIVCI4guQB5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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