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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a44e3198c4bb7176966777b8c0859732964a4b27a72ffad70bf66503d3398e9' 
  AND token = 'iF2x1//Ea8BWtlg2684H4jFGCR2sFx16yqvgBY18g/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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