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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c4415450dfdb2aa54390c7483625c8af16dbc5eb1fa0c8695f0faf0872db1d' 
  AND token = 'mwlihK2u8eDBLm5LI1XgkTCnTeW6E7HVg3jEseCweK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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