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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d7ff110dd338f429e08ae601f953fb07d52611f46d1db0d74af979ab3ce04a' 
  AND token = 'AiyN4/ul3vLJbizmG4IZD293ZLTTmkG8dykhvGQq0Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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