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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4252f6c80da202beb019c5882171377b7e77b5a4f73f944b87510c961a64ab13' 
  AND token = '9M8wUiCULulCzc/Z27U5BEIUU29qiX2Tu793tv3VuVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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