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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d767cd8cc4304fe3d2d3ddea3281995707c9722a1b3511aa31f7e503135eadc' 
  AND token = 'c94V+TjY9SCxt6czpsMd2wmfuzKf2E7MHPaYw/DYcbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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