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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad9e4ec3bc011ab2f17d7400cd05b1e1ca85812ef77218cad0a0926a3c6e1c7' 
  AND token = '8xls2BzHi40NImeeKrGByH+mmyh3DyWO0BYAh1fzAw4=' 
  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"
    }
  }
}