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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be97afe64474bf132d5b5284df0783611fb1ba6608a7f81fd2dd9e2661df15f' 
  AND token = 'RAh2wYv2DjAMi3zke1sImcz9yUwW7DLh6rMCsm+XoGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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