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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f62c920948b748590e252ac9a47f9c006a9b48f16462c2d5870062bc36a10d8' 
  AND token = 'Ip8TTf8TsZFbi5Pb86IAO7tt2eo7UlVSuAbZa8sqV0g=' 
  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"
    }
  }
}