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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5d630b01989fb3def1b73494a5eaa572f118eecf1462303f97456eceb9bee7' 
  AND token = 'CmAf2hDQ4Ewt+fo2AsDTOtdmyXR9KFSEn5PbgChuF3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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