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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c92179d42bb5b629b5621c4e9a190562d611ca9d5f73cbfd6612b207c0d91f' 
  AND token = 'KnvOlHsJt18xAHrpwEJ+ULtyajrINQmdZLrrm1oj4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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