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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508701741067bc1c6a580b403813135351cd595f9b346fde2aacb07154aa9d25' 
  AND token = '0P3imtY0GUFZblWnittS3hkvCTvvrbHQl95DjzrBB/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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