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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93963c2fe98a26c9979172d7c874b84ec6e82a97ad340ff024215a75be94c7bf' 
  AND token = 'PtcMpIKlc99R99OAQrSUuK0pkeNZWM/Q3vImiYG7xSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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