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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7204ba386cb4ec9225ba7b2fd7c6a18f5a1a9f91ae4c0acf60fa77049947543a' 
  AND token = 'MPNQuPIX+OoEXyKvxM4lw+yckTlbhwXpd4KtAAhYRz8=' 
  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"
    }
  }
}