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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5163d4114ef6f7c8b43519ae98df6d2bb6601b70c2ddb15e994ef1527ddc57fe' 
  AND token = 'PufSIvUzU71lDtreNWhE1ue/fNP0OuLWMKDknofUZKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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