SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4442c32bd89c7567746487567b303a15c499efa724d6f266ebe53d3ef891b08' 
  AND token = 'PyPPkBjsh1lgYSm9+h4QW5ka/epJzT+Ol7QK1i1Rwk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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