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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b320a9dcfd038ffa3ff9e5a53a0f380be81a55e693296cdc226dcd32be22e95' 
  AND token = 'LjwWb3Vjk1FRYLbpx2sQQpQ7M+oIjxgC72OZML8xzBg=' 
  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"
    }
  }
}