SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd483411584131b7dbc85f5cfe95abcf7c66d201e49c36b795e54702d0963e1d' 
  AND token = 'XB+GL02KiCNDAAmRIQYb+Uo6vEWymh2Fraq/CMGg9Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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