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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403fdc5c4eaf6f638ec9df5b1b3ebdd3a4d66174f23f42418d9d4c5de40c2f5c' 
  AND token = 'k84UESByy/keLYbfBYKkV3kV0/Q48dPXzmMI3E1MSW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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