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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556377d3425663a874a5a46cd07ab8d04dc15d2df5df402ee140ccc6d741a8db' 
  AND token = 'w+gkHlQ9FhO6uonPXaASUDe4pU4Jgqslq8letiLv0ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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