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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a947461b8920eba0a8f751834be1dcc62a9d7ae32d034350967c2602ce86aa' 
  AND token = '8k8uX/DsoQWmQ2ICZ8Q4UkYmae5tTPjupvDhGjEtkBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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