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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086e04a62873c5df237dbe73b58bf1af83449b6eb3689177efcf2c1340168a42' 
  AND token = 'byxGaFdRa3Lwp6KvgEA5uawSdXsuOwF9v88cx/ExWjk=' 
  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"
    }
  }
}