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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd480a3a059accdc8eaf49a4436b8656b8af34d14c64ecc391c80c8616bf58756' 
  AND token = 'ZsdYy8Rss2joPtzt0yGMspKr6bL5LNObIH4fmJarK1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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