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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5392bd34ac737a3e3a50c52fd2b88d770ce06322f45e2ecbfd3e522bdcc885e6' 
  AND token = 'pkgm8cg0P2E9vwrPLNW68TBo9r5a2vMtWhIzjMf53fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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