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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c08cddcfb30e97f1223ceec8386930fbea0701e910da92526965f017e30d41f' 
  AND token = 'jlHj0enkyYb/MpS21Bxstx5+rS1KyWWylkDhWJlN61M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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