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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc60a9dfa9f1d940f7b5950d9bd3c094e46ee469f67c43887b3eb1e98c3380ea' 
  AND token = 'Ul60Vg+iW7iCXq/O4uE17rCeAAzrVzEeyKkrE6EL5fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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