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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05118547a544d5695b75ee1d75bb20ecd1a1ada6225a57de1dc5667c03c06bc' 
  AND token = '/Y4Hsa96qHuMB3zeqV+lKKRwPHMjidqICxy2Ow9N9eI=' 
  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"
    }
  }
}