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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a9c6bea389858417ae3c334acdbcbe461c9284d49d9af20342b7fe70a79309' 
  AND token = '5mddimvJOnH6IcnadIfdNvIcH3ogjBxDkx9LZ/Snj7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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