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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f93d391f90ac36b4d0e1372c045b560b89fe3e91c747e02956df739fa604cd' 
  AND token = 'GqFGq6nNxTw046D0Ch+mJELQxBJTw+VvwDkrKbm830Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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