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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322644a2b61d5e960bd65e130e4174fda6979491b12b8ef0fac62979d68faa9b' 
  AND token = 'vfDstfJlC+Jx+EfSripnn1Jq+1e7wxcQKv18uWsS5XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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