SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b656077f593f4f8f17c2ab91db522de07a96430711397963ee3f783c3e28fc' 
  AND token = 'X+tBjFSZXwPaeK+H03WD4sdLs5A4wGnlvUh41gFBEZk=' 
  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"
    }
  }
}