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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3dbdcda592f9b01fed6191081e2760028c20b41c111a2b3aaef85735d0580f' 
  AND token = 'YruZ4p2l6QyIcRxy6jwF3d9+BpCukZGXu5td7slk5No=' 
  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"
    }
  }
}