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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526c6615dd9ef25fd7a6904120ca21e99d4c10ff075221276481ebb21d05e184' 
  AND token = '31Feow0o22Ip0LelKGBFRmatDsooKicXF+aPsCYBHn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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