SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8524f43bd54be85d05bb32514b1571c293982c7fb054da3c168a61846b0ee0' 
  AND token = 'Ew/NucrCjHApCJcNhAaGPVzqqFWQqITXtzBuI9jFy9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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