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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b6977024185f53680dee0e9e463952a454d0a12b9360ae13b835f9fc309e1b' 
  AND token = 'DmKtrnJs6BDU+lvmFfoli/vJ98wx5MiN4jdq7ItPnl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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